package daos;

import java.util.Date;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.LockMode;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import pku.ss.movieSystem.common.ComPaginationSupport;
import pku.ss.movieSystem.common.Constants;


/**
 * A data access object (DAO) providing persistence and search support for
 * Comment entities. Transaction control of the save(), update() and delete()
 * operations can directly support Spring container-managed transactions or they
 * can be augmented to handle user-managed Spring transactions. Each of these
 * methods provides additional information for how to configure it for the
 * desired type of transaction control.
 * 
 * @see daos.Comment
 * @author Rachel
 */

public class CommentDAO extends HibernateDaoSupport {
	private static final Log log = LogFactory.getLog(CommentDAO.class);
	// property constants
	public static final String CONTENT = "content";
	public static final String MOVIE = "movie";
	public static final String USER = "user";
	public static final String MOVIE_ID = "movie.movieId";
	
	private CommentUtilsDAO cutilsDao;

	protected void initDao() {
		// do nothing
	}

	public void save(Comment transientInstance) {
		log.debug("saving Comment instance");
		try {
			getHibernateTemplate().save(transientInstance);
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

	public void delete(Comment persistentInstance) {
		log.debug("deleting Comment instance");
		try {
			getHibernateTemplate().delete(persistentInstance);
			log.debug("delete successful");
		} catch (RuntimeException re) {
			log.error("delete failed", re);
			throw re;
		}
	}

	public Comment findById(java.lang.Integer id) {
		log.debug("getting Comment instance with id: " + id);
		try {
			Comment instance = (Comment) getHibernateTemplate().get(
					"daos.Comment", id);
			return instance;
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}

	public List findByExample(Comment instance) {
		log.debug("finding Comment instance by example");
		try {
			List results = getHibernateTemplate().findByExample(instance);
			log.debug("find by example successful, result size: "
					+ results.size());
			return results;
		} catch (RuntimeException re) {
			log.error("find by example failed", re);
			throw re;
		}
	}

	public List findByProperty(String propertyName, Object value) {
		log.debug("finding Comment instance with property: " + propertyName
				+ ", value: " + value);
		try {
			String queryString = "from Comment as model where model."
					+ propertyName + "= ?";
			return getHibernateTemplate().find(queryString, value);
		} catch (RuntimeException re) {
			log.error("find by property name failed", re);
			throw re;
		}
	}

	public List findByContent(Object content) {
		return findByProperty(CONTENT, content);
	}

	public List findByMovie(Object movie) {
		return findByProperty(MOVIE, movie);
	} 
	
	public List findAll() {
		log.debug("finding all Comment instances");
		try {
			String queryString = "from Comment";
			return getHibernateTemplate().find(queryString);
		} catch (RuntimeException re) {
			log.error("find all failed", re);
			throw re;
		}
	}

	public Comment merge(Comment detachedInstance) {
		log.debug("merging Comment instance");
		try {
			Comment result = (Comment) getHibernateTemplate().merge(
					detachedInstance);
			log.debug("merge successful");
			return result;
		} catch (RuntimeException re) {
			log.error("merge failed", re);
			throw re;
		}
	}

	public void attachDirty(Comment instance) {
		log.debug("attaching dirty Comment instance");
		try {
			getHibernateTemplate().saveOrUpdate(instance);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public void attachClean(Comment instance) {
		log.debug("attaching clean Comment instance");
		try {
			getHibernateTemplate().lock(instance, LockMode.NONE);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public static CommentDAO getFromApplicationContext(ApplicationContext ctx) {
		return (CommentDAO) ctx.getBean("CommentDAO");
	}
	
	/**
	 * find movies by movie name with paging
	 * find comments by movieId with paging
	 * @author Rachel
	 * @param movieId
	 * @param startIndex
	 * @param maxResults
	 * @return
	 */
	public ComPaginationSupport findCommentsByMovieId(int movieId, int startIndex, int maxResults) {
		
		DetachedCriteria criteria = DetachedCriteria.forClass(Comment.class);

		criteria.createAlias(Constants.USER, "user");
		criteria.createAlias(Constants.MOVIE, "movie");
		
		criteria.add(Restrictions.eq(MOVIE_ID, movieId));
		criteria.addOrder(Order.desc("comTimeStamp"));
	/*	if(maxResults == -1) {
			maxResults = Constants.PAGE_SIZE;
		}*/
		return cutilsDao.findPageByCriteria(criteria, Constants.CPAGE_SIZE, startIndex, true, Comment.class.getName());
	}
	
	public void setCutilsDao(CommentUtilsDAO cutilsDao) {
		this.cutilsDao = cutilsDao;
	}
	public CommentUtilsDAO getCutilsDao(){
		return this.cutilsDao;
	}
}